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© 2021 Reachmd Page 1 of 5 Transcriipt Detaiills This is a transcript of an educational program accessible on the ReachMD network. Details about the program and additional media formats for the program are accessible by visiting: https://reachmd.com/programs/clinicians-roundtable/antidepressants-the-lay-of-the- land/3346/ ReachMD www.reachmd.com [email protected] (866) 423-7849 Antidepressants: The Lay of the Land ANTIDEPRESSANTS: THE LAY OF THE LAND Regardlless of your speciiallty, Prozac, Zolloft, and Paxiill have become commonlly used and famiilliiar mediicatiions. What others shoulld we know? You are lliisteniing to ReachMD, The Channell for Mediicall Professiionalls. Wellcome to the Clliiniiciian''s Roundtablle. I am Dr. Leslliie Lundt, your host, and wiith me today iis Dr. Stephen M Stahll. Dr. Stahll iis Adjjunct Professor of Psychiiatry at the Uniiversiity of Calliiforniia iin San Diiego. He iis an iinternatiionalllly recogniized clliiniiciian, researcher, and teacher iin psychopharmacollogy and he has authored more than 350 artiiclles and chapters. Hiis llatest book iis the thiird ediitiion of Stahll''s Essentiiall Psychopharmacollogy. DR. LESLIE LUNDT: Welcome to ReachMD, Dr. Stahl. DR. STEPHEN M. STAHL: My pleasure to be here. DR. LESLIE LUNDT: How do you currently explain how antidepressants work in the brain. We have all seen these little commercials put out by the pharma companies with a little blob. I am wondering if that's really how they work? DR. STEPHEN M. STAHL: Well, I think that we know where the antidepressants bind, but I am not sure that that means we know how they work. Certainly, if the blobs are monoamines that’s probably the best bet we have to explain these drugs right now. The monoamines particularly serotonin is the most famous and norepinephrine it's sister, but even dopamine. These 3 monoamines sometimes called trimonoamines are the targets of every known antidepressant, and in fact it's only in research that we have ever identified a non-monoaminergic kind of mechanism that ever worked for depression. So, the current antidepressants someway or another we think boost monoamine neurotransmission and that’s how they are thought to work in the brain. © 2021 ReachMD Page 1 of 5 DR. LESLIE LUNDT: Boost monoamine transmission, but what kind of timeframe, clearly they don’t work right away. DR. STEPHEN M. STAHL: That’s good question. Indeed they do not work right away. It turns out that if you block a monoamine transporter that is an inactivator of a monoamine, it will cause a buildup of the monoamines, but not a very big one even though it’s a very sudden one. In fact, it probably makes them buildup sufficiently to cause a side effect, but not a therapeutic effect. So what's happening? Well, if you sustain the buildup of the monoamines, the neuron will react by down regulating certain receptors. Those receptors are mostly, if you will, bricks, they turn off the release of monoamines. So if you down regulate them or you cut the brick cable, boom, you get a big amount of monoamines being released, so we think what happens is that the antidepressants suddenly block transporters, which then causes the monoamines to indirectly decrease, down regulate the bricks of the neuron, which then 70 days later something like that will cause a much more profound increase of the monoamines, so it's thought that that increase of the monoamines with a delay is what's necessary in order to exert an antidepressant effect. DR. LESLIE LUNDT: Besides the basic SSRIs as I mentioned sertraline, fluoxetine, paroxetine, what other antidepressants are important for our listeners to know? DR. STEPHEN M. STAHL: Well, they certainly are the SNRIs or serotonin-norepinephrine reuptake inhibitors also called dual action drugs and of course there are 3 almost 4 of them. The 3 that are out there are Effexor (venlafaxine) is the branded name and unbranded name, then there is (duloxetine) Cymbalta, but you also have the new one Pristiq, which is desvenlafaxine and one that's imminent to be approved at the FDA, but not for depression, but perhaps for fibromyalgia called milnacipram. Those are SNRIs. We also have Wellbutrin, which is kind of in a class by itself also called bupropion and it's a dopamine and norepinephrine reuptake inhibitor or NDRI if you will. Of course, you have got old-fashioned trazodone, you got the tricyclics, you got the old MAO inhibitors. I will put a little plug in here. If the listeners are psychopharmacologists of any sophistication is one of the secret weapons in the armamentarium for treatment resistance, but almost nobody prescribes them anymore. So they are the major classes. The mirtazapine is a interesting drug. Remeron is in kind of a class by itself. It has alpha-2 antagonist properties, but it's not a reuptake blocker. DR. LESLIE LUNDT: Now you mentioned the newest one on the market is desvenlafaxine or Pristiq. What do we need to know about that, that’s probably the one people are least familiar with? DR. STEPHEN M. STAHL: Well, it is active metabolite of one that the listeners probably do know very well venlafaxine. It turns out that Effexor or venlafaxine is actually metabolized into desvenlafaxine just sort of like its name sound like. The main difference is that when you take desvenlafaxine © 2021 ReachMD Page 2 of 5 itself, you are not dependent on their conversion of the parent compound into it and that makes the net action more noradrenergic. In other words, venlafaxine is a little less noradrenergic at the end of the SNRI than is desvenlafaxine. So it’s a little more noradrenergic, it’s a little more predictable. It has perhaps fewer drug interactions, but it is very similar to venlafaxine. DR. LESLIE LUNDT: So, may be a bit more like Cymbalta than Effexor, is that one way to think about it? DR. STEPHEN M. STAHL: Well yes, in terms of its pharmacology, both Cymbalta and Pristiq are more noradrenergic. Their so called claim to fame of Pristiq, which will require marketing for a while to see if it's true is that it seems to be able to be used without much titration at least for the first line treatment of the easier patients. Mostly, Cymbalta and Effexor require some titration. Whether that will be true or whether it will be an advantage is really what we will have to find out if the drug is used in the early months. DR. LESLIE LUNDT: Now iif you are jjust jjoiiniing our diiscussiion, you are lliisteniing to the Clliiniiciian''s Roundtablle on ReachMD, The Channell for Mediicall Professiionalls. I am Dr. Leslliie Lundt, your host, and wiith me today iis Dr. Stephen M. Stahll. We are diiscussiing the llatest iin antiidepressant treatment. Dr. Stahl in your book, you have talked about the TMM, that was the new one for me. What are they? DR. STEPHEN M. STAHL: Well, it’s a trimonoamine modulator and what I mean by that were trimonoamines, they are serotonin, norepinephrine, and dopamine, and what is a modulator, it's something that may act either indirectly on monoamines or work if you will more better in the presence of an antidepressant that directly changes monoamines. What I mean by that it’s a number of hormones like estrogen, like thyroid. These agents in themselves possibly have a little bit of antidepressant effect that’s controversial and certainly not established, but certainly in combination with antidepressants can boost or modulate the trimonoamines that the antidepressant is already boosting or modulating and so give you a further efficacy boost to the antidepressant action. Another one is lithium, by itself at least in unipolar depression is not that good of a antidepressant, but can boost regular antidepressants and modulate monoamines while it's doing that and the new kid on the block is the L-methylfolate, which is the centrally active form of the vitamin folate. It's sister product would be S-adenosyl-methionine or SAMe and other natural products that could fall in this category include things as varied as testosterone, vitamin D, and omega-3 fatty acids, so these things are not as well investigated, none of them are approved as a monotherapy, but by various mechanisms, which we could discuss, but they all do have a way of boosting monoamines and helping antidepressants boost them if you will more better. DR. LESLIE LUNDT: Certainly, these "natural" treatments have a huge appeal with our patients. I note for me SAMe you know had some great press about 10 years or so ago, we tried it, and I can't say I ever noticed anything from SAMe, but now L-methylfolate and omega-3 fatty acids are sort of the rage. Is there any downside to at least trying them? © 2021 ReachMD Page 3 of 5 DR. STEPHEN M. STAHL: I don't think so. Some people are cynical and say that the mechanism of action of these agents is that they bind to money receptors. DR. LESLIE LUNDT: (laughs) DR. STEPHEN M. STAHL: They may do that, but actually the one that I am kind of interested in <_____> now is L-methylfolate. It turns out that L-methylfolate is a precursor for a co-factor that makes monoamine synthesis called biopterin and by doing that it can make more serotonin, norepinephrine, and dopamine. If you don't have folate, you can become depressed and people, who are folate deficient tend to have high levels of homocysteine, and if you give L-methylfolate, the homocysteine level will come down and particularly if you haven’t responded to an antidepressant, those are excellent candidates to give L-methylfolate for.
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